 ASCA: MCG-6-30-15 by NASA HEASARC

The mission result description reports a broad asymmetric iron K-alpha profile with a low-energy wing relative to the approximately $6.4\mathrm{keV}$ rest energy. It discusses gravitational redshift and the relativistic Doppler effect in a disk model. The page presents the original observational result and its interpretation, rather than establishing that every possible absorption or illumination model is excluded.